Akademik Veri Yönetim Sistemi
Journal of Alloys and Compounds, cilt.584, ss.640-645, 2014 (SCI-Expanded)
We have carried out 55Mn and 145Nd NMR measurements on re-entrant ferromagnets La1-xNdxMn2Si 2 (x = 0.35, 0.4). From the bulk magnetization measurements, the compound with x = 0.35 shows ferromagnetic properties in the temperature range from TCinter=305 to TNinter=165K, and antiferromagnetic properties down to ∼65 K. Then the compound orders ferromagnetically below TCNd=65K. A similar temperature dependence of magnetization is observed for x = 0.4. The 55Mn NMR frequencies of both compounds fall into range 160-163 MHz at 1.4 K and are about 166 MHz at 77 K without external magnetic field. The temperature dependence of resonance frequency has been measured for x = 0.35 in the temperature from 1.4 K up to 88 K. The frequency of 55Mn is almost independent of temperature in the ferromagnetic state within experimental error, and increases abruptly around 65 K corresponding to the transition between ferromagnetic and antiferromagnetic states. The Mn magnetic moment at 1.4 K is estimated to be 2.3μB in comparison with the results of neutron diffraction measurements. Zero-field 145Nd NMR have been observed at 415 MHz at 1.4 K for both compounds. Nd magnetic moments in La 1-xNdxMn2Si2 (x = 0.35, 0.4) are estimated to be 2.3μB from hyperfine field analysis. © 2013 Elsevier B.V. All rights reserved.